5-x/x-3/(x+3-16/x+3)化简

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5-x/x-3/(x+3-16/x+3)化简
5-x/x-3/(x+3-16/x+3)化简

5-x/x-3/(x+3-16/x+3)化简
写错了
=[(5-x)/(x-3)]/[(x²-9-16)/(x-3)]
=-(x-5)/(x+5)(x-5)
=-1/(x+5)

sinx在(π/6,π/2)递增，(π/2,2π/3)递减
所以x=π/2，y最大=sinπ/2=1
最小在边界
sinπ/6=1/2,sin2π/3=√3/2
所以1/2≤y≤1

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